drivers/staging/octeon/ethernet-mdio.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * This file is based on code from OCTEON SDK by Cavium Networks.
   4  *
   5  * Copyright (c) 2003-2007 Cavium Networks
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/ethtool.h>
  10 #include <linux/phy.h>
  11 #include <linux/ratelimit.h>
  12 #include <linux/of_mdio.h>
  13 #include <generated/utsrelease.h>
  14 #include <net/dst.h>
  15
  16 #include <asm/octeon/octeon.h>
  17
  18 #include "ethernet-defines.h"
  19 #include "octeon-ethernet.h"
  20 #include "ethernet-mdio.h"
  21 #include "ethernet-util.h"
  22
  23 #include <asm/octeon/cvmx-gmxx-defs.h>
  24
  25 static void cvm_oct_get_drvinfo(struct net_device *dev,
  26                                 struct ethtool_drvinfo *info)
  27 {
  28         strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
  29         strlcpy(info->version, UTS_RELEASE, sizeof(info->version));
  30         strlcpy(info->bus_info, "Builtin", sizeof(info->bus_info));
  31 }
  32
  33 static int cvm_oct_nway_reset(struct net_device *dev)
  34 {
  35         if (!capable(CAP_NET_ADMIN))
  36                 return -EPERM;
  37
  38         if (dev->phydev)
  39                 return phy_start_aneg(dev->phydev);
  40
  41         return -EINVAL;
  42 }
  43
  44 const struct ethtool_ops cvm_oct_ethtool_ops = {
  45         .get_drvinfo = cvm_oct_get_drvinfo,
  46         .nway_reset = cvm_oct_nway_reset,
  47         .get_link = ethtool_op_get_link,
  48         .get_link_ksettings = phy_ethtool_get_link_ksettings,
  49         .set_link_ksettings = phy_ethtool_set_link_ksettings,
  50 };
  51
  52 /**
  53  * cvm_oct_ioctl - IOCTL support for PHY control
  54  * @dev:    Device to change
  55  * @rq:     the request
  56  * @cmd:    the command
  57  *
  58  * Returns Zero on success
  59  */
  60 int cvm_oct_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
  61 {
  62         if (!netif_running(dev))
  63                 return -EINVAL;
  64
  65         if (!dev->phydev)
  66                 return -EINVAL;
  67
  68         return phy_mii_ioctl(dev->phydev, rq, cmd);
  69 }
  70
  71 void cvm_oct_note_carrier(struct octeon_ethernet *priv,
  72                           cvmx_helper_link_info_t li)
  73 {
  74         if (li.s.link_up) {
  75                 pr_notice_ratelimited("%s: %u Mbps %s duplex, port %d, queue %d\n",
  76                                       netdev_name(priv->netdev), li.s.speed,
  77                                       (li.s.full_duplex) ? "Full" : "Half",
  78                                       priv->port, priv->queue);
  79         } else {
  80                 pr_notice_ratelimited("%s: Link down\n",
  81                                       netdev_name(priv->netdev));
  82         }
  83 }
  84
  85 void cvm_oct_adjust_link(struct net_device *dev)
  86 {
  87         struct octeon_ethernet *priv = netdev_priv(dev);
  88         cvmx_helper_link_info_t link_info;
  89
  90         link_info.u64           = 0;
  91         link_info.s.link_up     = dev->phydev->link ? 1 : 0;
  92         link_info.s.full_duplex = dev->phydev->duplex ? 1 : 0;
  93         link_info.s.speed       = dev->phydev->speed;
  94         priv->link_info         = link_info.u64;
  95
  96         /*
  97          * The polling task need to know about link status changes.
  98          */
  99         if (priv->poll)
 100                 priv->poll(dev);
 101
 102         if (priv->last_link != dev->phydev->link) {
 103                 priv->last_link = dev->phydev->link;
 104                 cvmx_helper_link_set(priv->port, link_info);
 105                 cvm_oct_note_carrier(priv, link_info);
 106         }
 107 }
 108
 109 int cvm_oct_common_stop(struct net_device *dev)
 110 {
 111         struct octeon_ethernet *priv = netdev_priv(dev);
 112         int interface = INTERFACE(priv->port);
 113         cvmx_helper_link_info_t link_info;
 114         union cvmx_gmxx_prtx_cfg gmx_cfg;
 115         int index = INDEX(priv->port);
 116
 117         gmx_cfg.u64 = cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
 118         gmx_cfg.s.en = 0;
 119         cvmx_write_csr(CVMX_GMXX_PRTX_CFG(index, interface), gmx_cfg.u64);
 120
 121         priv->poll = NULL;
 122
 123         if (dev->phydev)
 124                 phy_disconnect(dev->phydev);
 125
 126         if (priv->last_link) {
 127                 link_info.u64 = 0;
 128                 priv->last_link = 0;
 129
 130                 cvmx_helper_link_set(priv->port, link_info);
 131                 cvm_oct_note_carrier(priv, link_info);
 132         }
 133         return 0;
 134 }
 135
 136 /**
 137  * cvm_oct_phy_setup_device - setup the PHY
 138  *
 139  * @dev:    Device to setup
 140  *
 141  * Returns Zero on success, negative on failure
 142  */
 143 int cvm_oct_phy_setup_device(struct net_device *dev)
 144 {
 145         struct octeon_ethernet *priv = netdev_priv(dev);
 146         struct device_node *phy_node;
 147         struct phy_device *phydev = NULL;
 148
 149         if (!priv->of_node)
 150                 goto no_phy;
 151
 152         phy_node = of_parse_phandle(priv->of_node, "phy-handle", 0);
 153         if (!phy_node && of_phy_is_fixed_link(priv->of_node)) {
 154                 int rc;
 155
 156                 rc = of_phy_register_fixed_link(priv->of_node);
 157                 if (rc)
 158                         return rc;
 159
 160                 phy_node = of_node_get(priv->of_node);
 161         }
 162         if (!phy_node)
 163                 goto no_phy;
 164
 165         phydev = of_phy_connect(dev, phy_node, cvm_oct_adjust_link, 0,
 166                                 PHY_INTERFACE_MODE_GMII);
 167         of_node_put(phy_node);
 168
 169         if (!phydev)
 170                 return -ENODEV;
 171
 172         priv->last_link = 0;
 173         phy_start(phydev);
 174
 175         return 0;
 176 no_phy:
 177         /* If there is no phy, assume a direct MAC connection and that
 178          * the link is up.
 179          */
 180         netif_carrier_on(dev);
 181         return 0;
 182 }